Walk down two flights of stairs, accessed through the back entrance of the James Hunt Funeral Home in Asbury Park, N.J., and you reach a white-walled, linoleum-floored, fluorescently-lit room, a liminal space that provides the beginning of an answer to one of the oldest and most confounding questions of the human experience: What happens to us when we die?

On a recent Tuesday evening, Shawn’te Harvell walked down the steps and into the room, where two bodies, covered in white cloth, lay on gurneys. Mr. Harvell was wearing crisp gray scrubs and two-tone leather shoes. This was a departure from his usual attire, noted Vivian Velazquez, the funeral home manager. “Usually, he’s here in his three-piece suit, his $500 shoes, and he doesn’t even wear that,” she said, pointing to the thin plastic apron that Mr. Harvell had tied around his waist.

Mr. Harvell smiled and shook his head. His job, by most metrics, is a messy one. He was in the room to embalm the bodies — to drain the blood vessels and cavities filled with fluid, refill them with preservatives, scrub the skin, suture any cuts, clean the teeth, sew the mouths closed. He was there to massage the illusion of life back into cold, dead cells. But Mr. Harvell has been studying embalming and practicing as an embalmer for nearly a quarter of a century, beginning when he was 16. So, no apron necessary.

Now in his 40s, Mr. Harvell is a professor of mortuary science at a local college, the manager of his own funeral home in Elizabeth and a trade embalmer who does nearly 50 embalmings a week; he is familiar with the often-fraught area between life and death. “My ultimate goal is to give them their loved one back,” he said of the people who would view the bodies at the upcoming funerals. “I’ve had families come up to me and tell me, ‘Wow, they look so nice I couldn’t even cry.’”

But the world he belongs to, the world of embalming, is increasingly losing its sway over the American way of death.

Data gathered by the National Funeral Directors Association shows that nearly 60 percent of Americans were cremated in 2021, an increase from around 25 percent in 1999. More than 60 percent of people surveyed were interested in having so-called green burials, which are cheaper than traditional funerals and limit the chemicals allowed into the body for preservation. Embalmers are becoming more difficult to find; most funeral homes rely on contractors like Mr. Harvell, who may be the sole embalmers for a dozen funeral-home clients.

According to people in the industry, things have been trending away from embalming for decades. “Absolutely there’s a shift going on,” said Tim Collison, the chief operating officer of The Dodge Company, the largest embalming fluid manufacturer in the country. “There’s less demand — it’s not an expanding market.” Dr. Basil Eldadah, a physician with the National Institute on Aging, said, “We’re just in this place in our society where we’re questioning the way that things have always been done.”

All human life is funneled through the narrow channel of death. The heart stops beating, neurons stop firing, muscles tense and begin to decay, cells decompose. From then on, the possibilities only expand.

You can be embalmed with formaldehyde and placed in a coffin underground; cremated in a furnace; left out in the open air; liquefied in an alkaline solution; composted under a pile of mulch; frozen in a cryogenic container; mummified; planted at the roots of a sapling. Ed Bixby, who owns 13 cemeteries around the country, said a new technique of treating dead bodies comes into fashion every year or so. Would you rather not have your ashes compressed into a diamond? Then how about freeze-drying your body and vibrating it into dust?

But, Mr. Bixby added, nothing has managed to outlive cremation and embalming and burial: “Everyone just goes with the norm because that’s what’s normal.”

Methods of body preservation go back thousands of years, to the 7,000-year-old Chinchorro mummies found in the Atacama Desert in Chile. But the most famous examples are from ancient Egypt. Deceased pharoahs and members of wealthy families underwent a monthslong mummification process that involved removing their internal organs, drying their bodies out with natron salt, and rubbing oil on their skin. Behind this ritual was the idea that a part of the person’s spirit lived in the body, and that it would be lost if the body was destroyed. The process was so effective that some mummies could be dug up by archaeologists, with the skin and facial structure more or less intact, 4,000 years later.

Egyptian mummification, aimed at eternity, bears little resemblance to modern American embalming, which began during the Civil War, when bodies of soldiers had to be transported on hot, unventilated trains. The objective was temporary preservation, maintaining an illusion of life just long enough for people to say goodbye. Abraham Lincoln was embalmed and paraded around the country after his assassination in 1865, the embalming treatment continually applied as his death tour went on for weeks. As embalming gained popularity and legitimacy through the 20th century, the viewing of the body often served as the centerpiece of the funeral ritual.

Methods and intent vary widely, shaped by cultural and circumstantial forces. But the belief underlying these ancient and modern practices seems to be somewhat universal — that the body contains some part of the person, some essence, some meaning.

“It’s quite profound,” said Dr. Raya Kheirbek, the chief of the Division of Geriatrics and Palliative Medicine at the University of Maryland School of Medicine. “Even after death claims the body, we’re going to beautify it in some way — like, death cannot win.”

Downstairs in the James Hunt Funeral Home, Mr. Harvell moved swiftly and deftly. The two bodies he was embalming were opposites: one small and bony, almost to the point of emaciation, the other large, the legs and feet swelling with edemas.

Every embalmer has a signature, Mr. Harvell said, as he pulled 16-ounce bottles of embalming fluid from the shelves of a tall wooden closet in the corner of the room. A bottle of orange fluid from The Dodge Company, 20 percent formaldehyde gas, dissolved in water — “20-index” — and mixed with plasticizers to keep the body from stiffening. A bottle of blue, 36-index fluid from Bondol Labs; designed for “frozen, refrigerated and cold bodies,” it contained salts with large ions to draw fluid out of the skin and keep it in the capillaries. A bottle of violet-red 18-index fluid from the Embalmers Supply Company for color and firmness. “We all have a certain thing we do,” Mr. Harvell said, dumping the liquid into a plastic tub atop a pressurized machine to create a frothy, turquoise mixture.

Formaldehyde sits at the heart of the embalming process. The gas fixes onto tissue proteins, stiffening them and inhibiting decomposition for roughly 24 hours. It is a vast improvement over the earliest embalming techniques, which sometimes entailed soaking a body in alcohol. But exposure to formaldehyde has been linked to cancer, and the door to Mr. Harvell’s room was plastered with biological hazard signs. He seemed unconcerned. “You’ve got to die from something,” he said with a shrug.

The trick is to distribute the fluid throughout the body, starting with a two-inch cut above the clavicle, through which arterial fluid is pumped into the carotid artery. The stomach is emptied, the contents replaced with high-index cavity fluid that dries and firms up the insides. The skin is scrubbed and washed, the cut sutured shut, the lips sewed together, makeup applied.

But to say that this is the extent of embalming, to embalmers, is like saying to a painter that painting consists only of long and short brushstrokes or saying to a writer that writing consists only of subjects and clauses. Mr. Harvell, looking up from his work, said, “I can teach the fundamentals of embalming, but to do it proficiently, to do it with that …” — he twisted his fist forward and back for emphasis — “you got to have it in you.”

There are products that dry out tissue, preventing liquid from leaking out of the pores of bloated bodies; powders to seal particularly large cuts; fluids with hues that counter the yellowing of jaundice. Dodge’s best-selling chemical is Introfiant, a high-index arterial fluid that some embalmers call Purple Jesus. “That’s because if they had to say a prayer to get the embalming done, they would grab the Introfiant,” Mr. Collison said.

But merely knowing the embalming basics and having the right tool kit is insufficient, said Krystal Osborne, an embalmer based in Las Vegas: “You’re given a picture, and you’re creating that person all over again.”

A few years ago, Dr. Kheirbek was invited to the funeral of one of her patients. It had been a week since the man had died, and Dr. Kheirbek and her team stood over the embalmed body, which lay in an open casket in the funeral home.

“For a moment, we thought we’d gone to the wrong visitation,” she later wrote in a journal article. “He looked better than he ever looked during the months we cared for him. His face was pink and smooth, his hair nicely groomed, and he sported a quiet smile. The Mr. Thompson we knew was a skeleton, with tight-drawn skin, long curly hair, and a shaggy beard.”

This incongruity triggered something in Dr. Kheirbek. It almost felt wrong to her, she wrote, like a willful blinding. The man was dead; why did he look like he was alive?

Jessica Mitford, in her 1963 book about the funeral industry, “The American Way of Death,” noted pointedly that many funeral homes took financial advantage of their customers by preying on “the disorientation caused by bereavement” and “the need to make an on-the-spot decision.” Today, the average embalming and funeral costs nearly $10,000. Burial plots and headstones cost even more. Much of this can ease the grieving process for people, Dr. Kheirbek said. But, she added, why pump the body with chemicals and restore it to reflect some past self?

In Japan, Nepal, Korea, and Taiwan, nearly everybody is cremated, while in most other countries, bodies are buried without being preserved artificially. Religion often plays an important role in these practices, but it can’t explain everything. The collection of trendy alternatives to embalming, burial and cremation that spring up each year often claim to be not just another option of body disposition, but a challenge to the social norms that shape how we treat and view the dead body.

Among the more prominent movements is that of the green burial. Some experts estimate that cremation in the United States releases half a million tons of carbon dioxide into the atmosphere each year. Others note that burials introduce four million tons of embalming fluid into the ground, and 1.6 million tons of concrete.

Mr. Bixby is the president of the Green Burial Council, a nonprofit that promotes natural burials, which consist of placing bodies in biodegradable coffins to reduce environmentally harmful waste. Dr. Eldadah, who is working to open a green-burial cemetery in Maryland, said that natural burials offered a potent philosophical alternative to what the philosopher Thomas Nagel called “the expectation of nothingness.”

“It’s not this fatalistic understanding of death as unavoidable, but it is a part of the cycle of life,” Dr. Eldadah said. “We need death in order to live happy lives, making space in order for more life to emerge.”

Dr. Kheirbek, who is friends with Dr. Eldadah, added: “And that’s the utmost love, I think. To just be able to let go.”

Mr. Collison’s company has developed a formaldehyde-free embalming fluid as a way to cater to the growing green burial demand, but he noted that of the nearly 50 billion pounds of formaldehyde that are produced every year, only a few million pounds end up in embalmed bodies. “When you look at the funeral service from a worldview, it doesn’t make a lot of sense,” he said of embalming. “But I think there’s a basic human need to say goodbye.”